A101445 Numbers n such that n is the largest prime factor of 1 + prime(n).

2, 3, 40087, 251737

Offset

1,1

Comments

No more terms below the (10^7)-th prime, i.e., 179424673. - Robert G. Wilson v, Jan 21 2005

Links

Table of n, a(n) for n=1..4.

Example

3 = the largest factor of 1 + prime(3) = 6, so 3 belongs to the sequence.

Mathematica

Select[ Prime[ Range[ 10^7]], Transpose[ FactorInteger[ Prime[ # ] + 1]][[1, -1]] == # &]

Crossrefs

Sequence in context: A212494 A197635 A171161 * A128668 A216977 A331426

Adjacent sequences: A101442 A101443 A101444 * A101446 A101447 A101448

Keyword

nonn

Author

Joseph L. Pe, Jan 18 2005

Status

approved